Kathleen Folbigg wins judicial appeal

A woman found guilty of killing her four children has been granted an inquiry to reassess her guilt.

In 2003, Kathleen Folbigg was found guilty over the children's deaths, which occurred separately over a 10-year period — 20-day-old Caleb, eight-month-old Patrick, 10-month-old Sarah and 18-month-old Laura.

She was sentenced to 30 years' jail for the murder of three of the children and manslaughter of the fourth.

Kathleen Folbigg has been granted a judicial appeal.

Folbigg and her friends have maintained over the last 15 years that the children all died of natural causes.

"Nobody wins here. Four children have died, but Kathleen is not responsible for those deaths," Helen Cummins told 9NEWS.

Today the NSW Attorney General, Michael Speakman, announced a judicial inquiry would be held into Folbigg’s convictions to ensure public confidence in the administration of justice.

Graphic evidence was heard during the original court case. (AAP)The Attorney General has apologised for the pain the appeal will cause the family. (AAP)

“Today’s decision is not based on any assessment of Ms Folbigg’s guilt,” Mr Speakman said.